I just searched and maybe these conversations don't come up as often as I thought. On the other hand, it's also difficult to nail this sort of topic down becaus

I just searched and maybe these conversations don't come up as often as I thought. On the other hand, it's also difficult to nail this sort of topic down because so many startups use Heroku, EngineYard, AWS, etc, so it's more like number of instances vs. number of servers. It seems Quora has a lot more insight. Examples here: http://www.quora.com/How-Many-Servers-Does-X-Have http://www.quora.com/How-Many-Servers-Does-X-Have